highly significantP < 0.001
The ANOVA results showed that the total regression coefficients of equations Y 2022 , Y 2023 and Y 2024 reached the highly significant level ( P < 0.001), and the lack of fit did not reach the significant level ( P > 0.05), which indicated that the models of equations Y2022, Y2023 and Y2024 were valid, and the regression equations were reasonably and reliably fitted.